Unfortunately, this is not supported by the HTML invoice templates. This will require changes in our core concept, so I can't tell you if or when this will be implemented.
But if you want you can get the HTML invoice generator code from GitHub
https://github.com/Invoicebus/html-invoice-generator/. This is open source so may use or modify it as you like.
From your photo I noticed you use Excel for the invoice, just to note that we also design Excel and Word invoices. Please contact me at
dim...@invoicebus.com for details.
Best,
Dimitar